Internal data structures

• char *source - the source of the molecule structure data.
• ResizeArray<CoorFileData *> coorIOFiles - data on which files containing atomic coordinates are to be read in by this object. Each CoorFileData instance contains data on which file to read, what type of file it is, and which frames to read from the file. The same data is stored in the case where a file is to be written instead of read.